Revert of Stub out Skia AVX and HSW opts.

skia/ext/SkOpts_avx_stub.cc

Index: skia/ext/SkOpts_avx_stub.cc
diff --git a/skia/ext/SkOpts_avx_stub.cc b/skia/ext/SkOpts_avx_stub.cc
deleted file mode 100644
index 3fdf872aea66acd021bbf5b1b5cd1283d2670ce9..0000000000000000000000000000000000000000
--- a/skia/ext/SkOpts_avx_stub.cc
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This is SkOpts_avx.cpp, stubbed out to do nothing.
-
-namespace SkOpts {
-    void Init_avx();
-    void Init_avx() {}
-}